Dual-Material Reflection Plate for LED Display Reliability
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Solution Overview
Problem
Display devices face challenges in simultaneously achieving high reflectance for optical efficiency and low resistance for electrical reliability, particularly with the formation of oxide films that degrade electrical characteristics in reflection plates used in light emitting diode (LED) displays.
Innovation Solution
The use of a dual-structured reflection plate with different materials for the first and second parts, where the second part has a higher reflectance and includes layers such as indium tin oxide (ITO), molybdenum (Mo), and aluminum (Al) to enhance reflectivity while minimizing oxide film formation and maintaining low resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a material with high reflectance is used for the reflection plate, then optical efficiency is improved, but oxide film formation increases resistance
Solution Approach 1:
The reflection plate is divided into two distinct parts: a first part made of a material resistant to oxide film formation (such as ITO, Mo, or Al) and a second part made of a material with high reflectance. This segmentation allows each part to fulfill its specific function without compromising the other, resolving the contradiction between optical efficiency and electrical reliability.
Solution Approach 2:
Different regions of the reflection plate are assigned different materials with optimized properties for their specific functions. The first part uses materials with low oxide formation tendency for electrical stability, while the second part uses materials with high reflectance for optical performance. This local differentiation of material properties resolves the technical contradiction.
2Ease of manufacture
If a single material is used for the reflection plate, then manufacturing is simplified, but both optical and electrical characteristics cannot be optimized simultaneously
Solution Approach 1:
The reflection plate employs a composite structure combining two different materials, each selected for its specific advantages. The first part uses materials like ITO, Mo, or Al that resist oxide formation, while the second part uses highly reflective materials. This composite approach achieves dual optimization of optical and electrical characteristics while maintaining manufacturing feasibility through established multi-layer deposition techniques.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration improves both the optical reflectance and electrical reliability of the display device by efficiently reflecting light and maintaining stable electrical connections, reducing the risk of screen failures due to oxide film formation.
Implementation Method 1
a second part extending from the first part, and the first part and the second part are formed of different materials from each other
Data Source
AI summary
Discussed is a display device that can include a substrate including an active area and a non-active area adjacent to the active area, the active area including plurality of sub pixels of at least one pixel, a plurality of light emitting diodes disposed in the plurality of sub pixels, respectively, and including a first electrode and a second electrode, respectively, a plurality of transistors disposed in the plurality of sub pixels, respectively, a plurality of reflection plates disposed below the plurality of light emitting diodes in the plurality of sub pixels, respectively, an insulating layer disposed on the plurality of reflection plates. The plurality of reflection plates respectively include a first part overlapping a contact hole of the insulating layer and a second part extending from the first part, and the first part and the second part include different materials from each other.